Balanced
Steady-State Feedback Radiation Damping: Balanced SSFR

Radiation damping (RD) is a second-order effect where
the signal-induced current in the receiver coil is strong enough to act back on
the signal-generating spins. Accordingly, it can be understood as a
self-regulating flip-back pulse. Active radiation damping feedback loops have
been introduced into the transmit-receive RF signal path as a means to either cancel,
or amplify the natural RD effect. Recently, Huang et al used RD feedback to
actively control the recovery of longitudinal magnetization immediately
following a non-selective saturation pulse. Here we investigate RD feedback as
a means to achieve increased SNR efficiency for short-TR, gradient-echo
sequences.